.github/workflows: sign Windows binaries

Fixes FiloSottile#326
Closes FiloSottile#328

Co-authored-by: Joshua Small <[email protected]>

.github/workflows/build.yml

@@ -10,6 +10,7 @@ jobs:
   build:
     name: Build binaries
     runs-on: ubuntu-latest
+    environment: "Build, sign, release binaries"
     steps:
       - name: Install Go
         uses: actions/setup-go@v2
@@ -21,6 +22,7 @@ jobs:
           fetch-depth: 0
       - name: Build binaries
         run: |
+          sudo apt-get update && sudo apt-get install -y osslsigncode
           cp LICENSE "$RUNNER_TEMP/LICENSE"
           echo -e "\n---\n" >> "$RUNNER_TEMP/LICENSE"
           curl "https://golang.org/LICENSE?m=text" >> "$RUNNER_TEMP/LICENSE"
@@ -31,6 +33,14 @@ jobs:
             cp "$RUNNER_TEMP/LICENSE" "$DIR/age"
             go build -o "$DIR/age" -ldflags "-X main.Version=$VERSION" -trimpath ./cmd/...
             if [ "$GOOS" == "windows" ]; then
+              for exe in "$DIR"/age/*.exe; do
+                /usr/bin/osslsigncode sign -t "http://timestamp.comodoca.com" \
+                  -certs .github/workflows/certs/uitacllc.crt \
+                  -key .github/workflows/certs/uitacllc.key \
+                  -pass "${{ secrets.SIGN_PASS }}" \
+                  -n age -in "$exe" -out "$exe.signed"
+                mv "$exe.signed" "$exe"
+              done
               ( cd "$DIR"; zip age.zip -r age )
               mv "$DIR/age.zip" "age-$VERSION-$GOOS-$GOARCH.zip"
             else

.github/workflows/certs/README

@@ -0,0 +1,14 @@
+In this folder there are
+
+    uitacllc.crt
+
+        PKCS#7 encoded certificate chain for a code signing certificate issued
+        to Up in the Air Consulting LLC valid until Sep 26 23:59:59 2024 GMT.
+
+        https://crt.sh/?id=5339775059
+
+    uitacllc.key
+
+        PEM encrypted private key for the leaf certificate above.
+        Its passphrase is long and randomly generated, so the awful legacy key
+        derivation doesn't really matter, and it makes osslsigncode happy.

.github/workflows/certs/uitacllc.key

@@ -0,0 +1,42 @@
+-----BEGIN RSA PRIVATE KEY-----
+Proc-Type: 4,ENCRYPTED
+DEK-Info: AES-256-CBC,B93C1A166F3677D68FB9CB3E8A184729
+
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+xsXxOOoL39GA0QpYjR6ztqR8fS9jTeu5IY+zY5LO8yS7+StP3H8CcqRMuxb3ntym
+-----END RSA PRIVATE KEY-----